OnReceiveContentListener: Handle IME insertion permissions release

For content insertion from the IME, the platform currently assumes
that it can automatically revoke URI permissions (via
InputContentUriTokenHandler.finalize) any time after the
InputContentInfo instance is garbage collected and
InputContentInfo.releasePermission() has not been called explicitly.
This can cause permissions to be revoked before the receiving code
has had a chance to read the content when using
OnReceiveContentListener, since we did not keep a reference to
InputContentInfo.

This change does the following:
* Sets the InputContentInfo instance in the ContentInfo payload passed
to OnReceiveContentListener.
* Exposes a hidden API on ContentInfo to allow system features to
proactively release permissions for sources that allow this (IME and
drag-and-drop).
* Updates notifications direct-reply code to proactively release
permissions as soon as they are no longer needed.

Bug: 183643556
Test: Manual
Change-Id: I1cbc55d53804810a3cd4b6b97c197f4dd2d7d8e6